首页|秋季喀拉海海冰对2020和2021年12月京津冀冷暖反相的影响

秋季喀拉海海冰对2020和2021年12月京津冀冷暖反相的影响

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京津冀2020年12月气温异常偏低,而2021年12月异常偏高.这两年冬季均处在拉尼娜背景下,但秋季喀拉海海冰异常有明显差异,可能是京津冀这两年12月气温异常潜在的外强迫信号.这2年秋季喀拉海海冰通过中高纬温度经向梯度差异引起大气环流异常,进而导致京津冀12月气温异常.2020年秋季喀拉海海冰异常偏少,导致12月西伯利亚高压偏强,乌拉尔山阻塞高压亦偏强,欧亚地区为典型的经向环流,造成京津冀12月气温异常偏低,而2021年的秋季海冰和12月环流形势均与2020年相反.
Impact of the Autumn Kara Sea Ice on Opposite Temperature Anomalies in December of 2020 and 2021 in Beijing-Tianjin-Hebei Region
The temperature is abnormally low in December 2020 in Beijing-Tianjin-Hebei region,while has the opposite trend in December 2021.Although La Nina occurring during both winter,there are obvious differences in the Kara Sea sea ice anomaly in autumn,which may be the potential external forcing signal of the opposite temperature trends.The sea ice in the Kara Sea caused the atmospheric circulation anomaly through the difference of the meridional gradient of temperature in the middle and high latitudes,which led to the temperature anomaly in December in Beijing,Tianjin and Hebei.Sea ice was anomalous less in the key areas of the Kara Sea in autumn of 2020,leading to intensified Siberian high and the blocking high in the Ural Mountains and a typical dimensional pattern prevailing over Eurasian continent in December 2020,which favored low temperatures in Beijing-Tianjin-Hebei region.Sea ice in autumn of 2021 and atmospheric circulation in December 2021 were opposite to the trend of 2020.

Beijing-Tianjin-Hebei Regionearly winter temperatureautumn sea iceKara Sea

车少静、高辉、韩世茹、李晓帆、杜浩昱

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河北省气候中心,河北 石家庄 050021

国家气候中心,北京 100081

京津冀 初冬气温 秋季海冰 喀拉海

国家自然科学基金国家重点研发计划河北省气象局科研开发项目延伸期重要天气过程智能预测技术创新团队项目

NSFC421750482018YFC150560421ky02

2024

沙漠与绿洲气象
新疆维吾尔自治区气象学会 中国气象局乌鲁木齐沙漠气象研究所

沙漠与绿洲气象

CSTPCD
影响因子:1.007
ISSN:1002-0799
年,卷(期):2024.18(2)
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